The SRD only gives a means to determine costs and weights of weapons for Large and Small versions based on the Medium weapons. Any other supplied values are the author's best determination.

The frostfrail bow is a very large and powerful bow built from the bones of creatures found throughout Blüdfrost. Its appearance is that of a long, thick spike protruding from both ends, which is used to brace against a solid object (either the ground or an overhanging protrusion or ceiling) to aid in pulling the bow's string. A character may use a frostfrail bow as a martial weapon, but doing so imparts a -4 penalty on attack rolls. Firing an arrow from the bow requires a full round action.
A Frostfrail Bow is treated as a Longbow for the purpose of feats.